sources close to the fbi is that the fbi had been investigating general petraeus and as part of a larger investigation, the name of paula broadwell, who is general petraeus' biographer. she wrote a book that came out in january called-"all in, the education of general david h. petraeus." she had spent about a year in afghanistan with him, documenting his life, and it seems that the fbi was investigating something broader. her name came up. they started investigating concern that general petraeus now head of the cia was possibly some sort of victim in it or could be -- could be blackmailed in some sort of way. they never found that. but in the process, they uncovered this affair. now, there are also questions that are raised tonight, laura, about if this affair occurred while he was still a four star general key face some sort of military punishment? of course, it's against the ucmj code to van affair. could he be demoted? key face further cobs sequences? we really don't know the answer to that right now. sources confirming to fox that the affair was with paula broadwell, his biographer.